Abstract : This technical report documents an overview of groundwater hydrology and a current technology review of equipment, methods, and techniques used in groundwater field investigations. Numerous topics applicable to the planning, scheduling, data collection, and integration steps essential in a comprehensive field program are addressed. The report, targeted for installation engineers and managers responsible for evaluation of or response to suspected instances of groundwater contamination, consists of two volumes. Volume II: Desk Reference. A comprehensive survey of technbical works resulted in this compilation of groundwater fundamentals and field investigation activities. Topical coverage ranges from hydrology basics to state-of-the-art equipment and field methods. Sufficient material is presented to acquaint the reader with basic concepts and fundamentals of groundwater and water quality issues. Numerous illustrations highlight these items. An applications-oriented review of field methods identifies equipment types and limitations. The essentials of geophysics, drilling methods, well construction, and sampling are addressed, with emphasis on integrating information in an iterative process to devise a cost-effective program. A review of contaminant transport in groundwater identifies significant parameters and physical systems of concern. Finally, a summary of groundwater treatment methods provides an options list for potential use. The report concludes with an agency address directory for water quality information and some representative cost schedules for field activities.